RF-SM-1077B1 Ultra-Low-Power 868 MHz & 915 MHz Wireless … · RF-SM-1077B1 Ultra-Low-Power 868...

RF-SM-1077B1 Ultra-Low-Power 868 MHz &

915 MHz Wireless Module

Version 2.1

Shenzhen RF-star Technology Co., Ltd.

Aug. 02, 2018

RF-SM-1077B1

www.szrfstar.com Ver2.1- Aug., 2018

Shenzhen RF-star Technology Co., Ltd. Page 1 of 27

1 Device Overview

1.1 Description

RF-SM-1077B1 Sub-1 GHz module is based on TI CC1310, which combines a flexible, very low-power RF transceiver

with a powerful 48 MHz ARM® Cortex®-M3 microcontroller supporting multiple physical layers and RF standards and a

dedicated radio controller Cortex®-M0 handling RF protocol commands that are stored in ROM or RAM. RF-SM-1077B1

integrates a 24.0 MHz crystal, a balun, a band pass filter, an antenna matching and an IPEX antenna matching which

make the module low cost, low power consumption and long wireless communication in Sub-1 GHz.

RF-SM-1077B1 is flashed transparent transmission firmware with AT commands by default. The default values are as

follows: 115200 baud rate, 8 data bit, no parity check bit,1 stop bit, 868 MHz operating frequency, 14 dBm TX power.

When the module starts to work, the serial port will print “Application Start\r\n”, and start transparent transmission mode

by default, serial port will transmit all the data except “+++”, please refer to the AT command in detail.

1.2 Key Features

Microcontroller

- Powerful ARM® Cortex®-M3 processor

- EEMBC CoreMark® Score: 142

- EEMBC ULPBench™ score: 158

- Clock speed up to 48 MHz

- 128 KB of in-system programmable flash

- 8 KB of SRAM for Cache (or as general-purpose

- 20 KB of ultra-low-leakage SRAM

- 2-pin cJTAG and JTAG debugging

- Supports over-the-air (OTA) update

On-Chip Internal DC/DC Converter

Ultra-Low-Power Sensor Controller

- Can run autonomously from the rest of the

- System

- 16-bit architecture

- 2 KB of ultra-low-leakage SRAM for code and data

RF-Section

- Excellent receiver sensitivity: –124 dBm @ long-

range mode, –110 dBm @ 50 kbps

- Excellent selectivity (±100 kHz): 56 dB

- Excellent blocking performance (±10 MHz): 90 dB

- Programmable output power up to +14 dBm

- Single-ended or differential RF interface

- Suitable for systems targeting compliance with

worldwide radio frequency regulations

ETSI EN 300 220, EN 303 204 (Europe)

FCC CFR47 Part 15 (US)

ARIB STD-T108 (Japan)

- Wireless M-Bus (EN 13757-4) and IEEE®

802.15.4g PHY

Peripherals

- All digital peripheral pins can be routed to any

- Four general-purpose timer modules (eight 16-bit

or four 32-bit timers, PWM each)

- 12-bit ADC, 200 ksamples/s, 8-channel analog

- Continuous time comparator

- Ultra-low-power clocked comparator

- Programmable current source

- UART

- 2× SSI (SPI, MICROWIRE, TI)

- I2C, I2S

- Real-time clock (RTC)

- AES-128 security module

RF-SM-1077B1

- True random number generator (TRNG)

- Support for eight capacitive sensing buttons

- Integrated temperature sensor

Low Power

- Wide supply voltage range: 1.8 V to 3.8 V

- RX: 5.4 mA

- TX at +10 dBm: 13.4 mA

- Active-mode MCU 48 MHz running Coremark: 2.5

mA (51 μA/MHz)

- Active-mode MCU: 48.5 CoreMark/mA

- Active-mode sensor controller at 24 MHz: 0.4 mA

+ 8.2 μA/MHz

- Sensor controller, one wake-up every second

performing one 12-bit ADC sampling: 0.95 μA

- Standby: 0.7 μA (RTC running and RAM and CPU

retention)

- Shutdown: 185 nA (wakeup on external events)

1.3 Applications

868-, 915-MHz ISM and SRD systems

Low-power wireless systems with 50-kHz to 5-MHz

channel spacing

Home and building automation

Wireless alarm and security systems

Industrial Monitoring and Control

Smart grid and automatic meter reading

Wireless healthcare applications

Wireless sensor networks

Active RFID

IEEE 802.15.4g, IP-enabled smart objects

(6LoWPAN), wireless M-Bus, KNX systems,

Wi-SUN™, and proprietary systems

Energy-harvesting applications

Electronic shelf label (ESL)

Long-range sensor applications

Heat-cost allocators

1.4 Functional Block Diagram

Figure 1. Functional Block Diagram of RF-SM-1077B2

CC1310

IPEX Interface

Band Pass Filter

Power Supply

1.8 V ~ 3.8 V

Antenna Matching

24.0 MHz

32.768 kHz

RF-SM-1077B1

1.5 Working Mode

Figure 2. Working Mode of RF-SM-1077B1

1.6 Part Number Conventions

The part numbers are of the form of RF-SM-1077B1 where the fields are defined as follows:

Figure 3. Part Number Conventions of RF-SM-1077B1

RF SM 1077

RF-STAR

Company Name

Sub-1 GHz Module

Wireless Type

Chipset Manufacturer

TI CC1310F128RGZ

- - B1

Module Version

Version Number

RF-SM-1077B1

Table of Contents

1 Device Overview ............................................................................................................................................................. 1

1.1 Description............................................................................................................................................................ 1

1.2 Key Features ....................................................................................................................................................... 1

1.3 Applications .......................................................................................................................................................... 2

1.4 Functional Block Diagram .............................................................................................................................. 2

1.5 Working Mode ..................................................................................................................................................... 3

1.6 Part Number Conventions .............................................................................................................................. 3

Table of Contents ................................................................................................................................................................ 4

Table of Figures ................................................................................................................................................................... 5

Table of Tables ..................................................................................................................................................................... 6

2 Module Configuration and Functions ...................................................................................................................... 7

2.1 Module Parameters ........................................................................................................................................... 7

2.2 Module Pin Diagram ......................................................................................................................................... 8

2.3 Pin Functions ....................................................................................................................................................... 8

3 Specifications ................................................................................................................................................................. 10

3.1 Recommended Operating Conditions ..................................................................................................... 10

3.2 Handling Ratings .............................................................................................................................................. 10

3.3 Power Consumption ....................................................................................................................................... 10

3.3.1 Current Consumption ........................................................................................................................ 10

3.3.2 Power Consumption Test ................................................................................................................. 12

4 Functions ......................................................................................................................................................................... 12

4.1 Transparent Transmission ............................................................................................................................ 12

4.2 Sensor Data Collection .................................................................................................................................. 13

5 AT Command .................................................................................................................................................................. 14

5.1 AT Command Format Description ............................................................................................................. 14

5.2 AT Commands ................................................................................................................................................... 15

5.2.1 Start / Exit AT Command Mode ..................................................................................................... 15

5.2.2 Parameter Query / Configuration .................................................................................................. 15

5.2.3 RF Power Query / Configuration ................................................................................................... 15

5.2.4 Channel Query / Configuration ...................................................................................................... 16

5.2.5 Received RSSI Query ....................................................................................................................... 16

5.2.6 Device MAC Address Query........................................................................................................... 16

RF-SM-1077B1

5.2.7 Enable / Disable AD Voltage Collection ..................................................................................... 16

5.2.8 Software / Hardware Version Query ............................................................................................ 17

5.2.9 Module Restart ..................................................................................................................................... 17

5.2.10 Module Reset ..................................................................................................................................... 17

5.2.11 AT Command Table .......................................................................................................................... 17

6 Application, Implementation, and Layout............................................................................................................. 19

6.1 Module Photos .................................................................................................................................................. 19

6.2 Recommended PCB Footprint .................................................................................................................... 20

6.3 Antenna ................................................................................................................................................................ 20

6.4 Schematic Diagram ......................................................................................................................................... 21

6.5 Basic Operation of Hardware Design ...................................................................................................... 22

6.6 Trouble Shooting .............................................................................................................................................. 23

6.6.1 Unsatisfactory Transmission Distance ........................................................................................ 23

6.6.2 Vulnerable Module .............................................................................................................................. 24

6.6.3 High Bit Error Rate ............................................................................................................................. 24

6.7 Electrostatics Discharge Warnings ........................................................................................................... 24

6.8 Soldering and Reflow Condition ................................................................................................................. 24

4.9 Optional Packaging ......................................................................................................................................... 25

7 Certification ..................................................................................................................................................................... 26

7.1 Reach ................................................................................................................................................................... 26

7.2 RoHS .................................................................................................................................................................... 26

8 Revision History ............................................................................................................................................................ 27

9 Contact Us ....................................................................................................................................................................... 27

Table of Figures

Figure 1. Functional Block Diagram of RF-SM-1077B2 ............................................................................. 2

Figure 2. Working Mode of RF-SM-1077B1.................................................................................................... 3

Figure 3. Part Number Conventions of RF-SM-1077B1 ............................................................................ 3

Figure 4. Pin Diagram of RF-SM-1077B1 ........................................................................................................ 8

Figure 5. Photos of RF-SM-1077B1 ................................................................................................................. 19

Figure 6. Top View of RF-SM-1077B1 (mm) ................................................................................................. 20

Figure 7. Specification of Antenna Seat ......................................................................................................... 20

RF-SM-1077B1

Figure 8. Specification of IPEX Wire ................................................................................................................ 21

Figure 9. Schematic Diagram of RF-SM-1077B1 ....................................................................................... 21

Figure 10. Recommendation of Antenna Layout ......................................................................................... 23

Figure 11. Recommended Reflow for Lead Free Solder.......................................................................... 25

Figure 12. Optional Packaging Mode .............................................................................................................. 25

Figure 13. SRRC Certificate................................................................................................................................ 26

Figure 14. RoHS Certificate ................................................................................................................................ 26

Table of Tables

Table 1. Parameters of RF-SM-1077B1 ........................................................................................................... 7

Table 2. Pin Functions of RF-SM-1077B1 ....................................................................................................... 8

Table 3. Recommended Operating Conditions of RF-SM-1077B1 ...................................................... 10

Table 4. Handling Ratings of RF-SM-1077B1 .............................................................................................. 10

Table 5. Current Consumption of RF-SM-1077B1...................................................................................... 10

Table 6. Power Consumption of RF-SM-1077B1 ........................................................................................ 12

Table 7. AT Command Table ............................................................................................................................. 17

RF-SM-1077B1

2 Module Configuration and Functions

2.1 Module Parameters

Table 1. Parameters of RF-SM-1077B1

Chipset CC1310F128RGZ

Supply Power Voltage 1.8 V ~ 3.8 V, recommended to 3.3 V

Frequency 868 MHz, 915 MHz

Maximum Transmit Power +14.0 dBm

Receiving Sensitivity -124.0 dBm (@long range mode)

-110.0 dBm (@50 kpbs)

GPIO 30

Crystal 24 MHz, 32.768 kHz

RAM 20 KB

Flash 128 KB

Package SMT Packaging

Frequency Error ±20 kHz

Dimension 26.0 mm x 18.0 mm x (2.3 ± 0.1) mm

Type of Antenna IPEX interface

Operating Temperature -40 ℃ ～ +85 ℃

Storage Temperature -40 ℃ ～ +125 ℃

RF-SM-1077B1

2.2 Module Pin Diagram

Figure 4. Pin Diagram of RF-SM-1077B1

2.3 Pin Functions

Table 2. Pin Functions of RF-SM-1077B1

Pin Name Chip Pin Pin Type Description

1 P01 DIO_1 Digital I/O GPIO, Sensor Controller

2 P02 DIO_2 Digital I/O RX (GPIO, Sensor Controller)

3 P03 DIO_3 Digital I/O TX (GPIO, Sensor Controller)

8 P08 DIO_8 Digital I/O GPIO

RF-SM-1077B1

16 TMS JTAG_TMSC - JTAG TMS

17 TCK JTAG_TCKC - JTAG TCK

18 P16 DIO_16 Digital I/O JTAG TDO

19 P17 DIO_17 Digital I/O JTAG TDI

25 RESET RESET_N - Reset, active low. No internal pullup.

26 P23/ADC0 DIO_23 Digital or analog I/O GPIO, Sensor Controller, analog

27 P24/ADC1 DIO_24 Digital or analog I/O GPIO, Sensor Controller, analog

28 P25 DIO_25 Digital or analog I/O GPIO, Sensor Controller, analog

34 VCC VCC - 1.8 V ~ 3.6 V, recommended to 3.3 V

35 ANT - - External antenna pin

36 GND GND - ground

RF-SM-1077B1

3 Specifications

3.1 Recommended Operating Conditions

Functional operation does not guarantee performance beyond the limits of the conditional parameter values in the table

below. Long-term work beyond this limit will affect the reliability of the module more or less.

Table 3. Recommended Operating Conditions of RF-SM-1077B1

Items Condition Min. Typ. Max. Unit

Operating Supply Voltage Battery Mode 1.8 3.3 3.8 V

Operating Temperature / -40 +25 +85 ℃

Environmental Hot Pendulum / -20 +20 ℃/min

Notes:

To ensure the RF performance, the ripple wave on the source must be less than ±200 mV.

3.2 Handling Ratings

Table 4. Handling Ratings of RF-SM-1077B1

Items Condition Min. Typ. Max. Unit

Storage Temperature Tstg -40 +25 +125 ℃

Human Body Model HBM ±3000 V

Moisture Sensitivity Level 2

Charged Device Model ±500 V

3.3 Power Consumption

3.3.1 Current Consumption

The current consumption characteristics of this module are categorized into different running modes. The overall product

level current consumption is averaged over time on different power modes the device runs on. The peripheral circuitry’s

current consumption also adds in.

Table 5. Current Consumption of RF-SM-1077B1

Parameter Test Conditions Min. Typ. Max Unit

Core Current Consumption

Icore Core current

Reset. RESET_N pin asserted or VDDS below

power-on-reset (POR) threshold

RF-SM-1077B1

consumption Shutdown. No clocks running, no retention 185 nA

Standby. With RTC, CPU, RAM and (partial)

register retention. RCOSC_LF

Standby. With RTC, CPU, RAM and (partial)

register retention. XOSC_LF

Idle. Supply Systems and RAM powered. 570 μA

Active. MCU running CoreMark at 48 MHz

1.2 mA + 25.5

µA/MHz

Active. MCU running CoreMark at 48 MHz 2.5 mA

Active. MCU running CoreMark at 24 MHz 1.9 mA

Radio RX, 868 MHz 5.5 mA

Radio TX, 10-dBm output power, (G)FSK, 868

Radio TX, OOK modulation, 10-dBm output

power, AVG

Radio TX, boost mode (VDDR = 1.95 V), 14-dBm

output power, (G)FSK, 868 MHz

Radio TX, OOK modulation, boost mode (VDDR

= 1.95 V), 14 dBm, AVG

Radio TX, boost mode (VDDR = 1.95 V), 15-dBm

output power, (G)FSK, measured on RF-SM-

1077B2, 433.92 MHz

Radio TX, 10-dBm output power, measured on

RF-SM-1077B2, 433.92 MHz

Peripheral Current Consumption (Adds to core current Icore for each peripheral unit activated) (1) (2) (3)

Peripheral

domain

Delta current with domain enabled

Serial power

domain Delta current with domain enabled

RF-SM-1077B1

RF Core Delta current with power domain enabled, clock

enabled, RF core idle

237 µA

µDMA Delta current with clock enabled, module idle 130 µA

Timers Delta current with clock enabled, module idle 113 µA

I2C Delta current with clock enabled, module idle 12 µA

I2S Delta current with clock enabled, module idle 36 µA

SSI Delta current with clock enabled, module idle 93 µA

UART Delta current with clock enabled, module idle 164 µA

(1) Adds to core current Icore for each peripheral unit activated.

(2) Iperi is not supported in standby or shutdown modes.

(3) Measured at 3.0 V.

3.3.2 Power Consumption Test

Table 6. Power Consumption of RF-SM-1077B1

Mode Min. Current Max. Current Average Current Samples

Idle 1.29 mA 1.32 mA 1.31 mA 5000

Standby 68 nA 69.2 µA 980 nA 5000

Shutdown 52 nA 88 nA 79 nA 5000

RF-RX 5.2 mA 5.7 mA 5.4 mA 5000

RF-TX - 25.2 mA (14 dBm) - -

Test conditions: battery power supply: 2.88 V. Test instrument: RIGOL DM3068 digital multimeter.

Data of RF-TX only provide peak value as a reference, the average power is proportional to the frequency of data

transmission.

4 Functions

4.1 Transparent Transmission

Transparent transmission mode is that the data is transmitted to a remote device.

The function is realized under the following conditions:

1. Two or more devices are in the same frequency.

2. The address of the devices are allowed to connect each other.

RF-SM-1077B1

Users can define the channel of each device according to the condition, and only the devices which are in the same

frequency and the same channels can communicate. The device channel can be defined by AT command, please kindly

refer to the chapter of “AT Command”.

Transparent transmission rate: The device communicates through RF under IEEE 802.15.4g standard with three

transmission rates: 625 bps, 50 Kbps, 200 Kbps.

Data confirmation process mechanism is contained in transparent transmission. The mechanism contains timeout of

receiving confirmation packet. This protocol defines the values of timeout period in different mode:15 ms for 200 Kbps,

35 ms for 50 Kbps, 500 ms for 625 bps. At the same time, the packet sizes are regulated according to the different

modes:128 bytes for 200 Kbps and 50 Kbps data rate mode (the serial number size of the packet contains 2 bytes, so

the actual packet size is no more than 126 bytes), and 30 bytes for 625 bps data rate mode (the serial number size of

the packet contains 2 bytes, so the actual packet is no more than 28 bytes). When the packet size is over the defined

maximum packet size, the default processing mechanism is only sending packets with the same defined packet size,

and the extra data will be discarded directly.

Transparent transmission mechanism: The device starts transparent transmission mode by default when power on,

that is to say, the data which received from the serial port will be transmitted. "+++" string is the startup command of AT

command, transparent transmission mode will be disabled when serial port receives this command, and then the module

enters into AT command mode (please refer to “AT command” chapter for details). The module will enter into transparent

transmission mode after exiting AT command mode.

This module is designed for long distance transmission and lower data transmitting rate, transparent transmission mode

is recommended when lower requirement on low transmission rate.

4.2 Sensor Data Collection

CC1310 integrates a Sensor Controller, which supports data collection under low power mode. RTC provides work clock

for Sensor Controller, e.g. Sensor Controller executes operation every 100 ms when RTC clock settled in 100 ms, after

the operation executed. Sensor Controller will enter into low power consumption mode automatically. Application layer

can control the data collection frequency of sensor through RTC. Sensor Controller controls 7 digital I/Os (DIO1 ~ DIO7),

8 digital/simulation I/Os (DIO23 ~ DIO30), and these I/Os can be configured as SPI, I2C, ADC etc.

This protocol is configured with AD voltage acquisition function by default. This function enables two ADC channels

(channel 0 is DIO23, channel 1 is DIO24). AD voltage acquisition range is 0 V~ 3.8 V. Sensor Controller control RTC to

provide the clock for AD acquisition, and collect data once every second by default. Users can control the enable and

disable of AD voltage collection through AT commands (please refer to “AT command” chapter for details).

RF-SM-1077B1

5 AT Command

The string which starts with "AT#" will be parsed and executed as an AT command, and the AT command will be returned

from the serial port as it is. Then the execution result will be output. "OK↲" means successful operation, "ERROR↲"

means error operation, and "FAIL↲" means failed operation.

5.1 AT Command Format Description

AT command format: "AT#EXIT" + "Enter". The letters in AT commands are not case-sensitive unless otherwise

specified. The specific format is as follows:

AT command start character: All AT commands must start with "AT" characters, which is not case-sensitive.

Command delimiter: The separator of "AT" start character and the command type is fixed as "#" character.

AT command type: AT command type, such as "RF", "UART", which is not case-sensitive.

Parameter separator: Parameter separator is used to separate the command type and configuration parameters or

separate multiple configuration parameters, which is fixed as a space bar.

Parameter start character: The configuration parameter start character indicates the start character of the configuration

parameter, which is fixed as "-".

Parameter identifier: Parameter identifier indicates the meaning of the configuration parameter. The different

configuration parameters of the identifier will be different, which is not case-sensitive. Please refer to “AT Command” for

details.

Parameter configuration: Different configuration parameters have different range of values, please refer to t“AT

Command” for details.

Command end character: AT Command terminator is used to indicate that the command ends, which is fixed as

carriage return linefeed “↲”(\r\n).

RF-SM-1077B1

5.2 AT Commands

5.2.1 Start / Exit AT Command Mode

"+++": Start AT command mode.

Enter the command into serial port means that the device will enter into AT command mode. When the serial port prints

"OK↲", which means start the AT command mode successfully. Then the data received from the serial port will be

regarded as AT command.

"AT#EXIT↲": Exit AT command mode.

Enter the command into serial port means that the device will exit AT command mode and then enter into transparent

transmission mode. When the serial port prints "OK↲", which means exit AT command mode successfully. Then the

data except "+++" received from the serial port will be transmitted as transparent data.

5.2.2 Parameter Query / Configuration

"AT#UART↲": Query parameter.

Enter the command into the serial port. When the serial port prints "OK↲", which means successful operation, in the

meanwhile, the device parameters will be returned. If “AT#UART-Bxxxx-Dx-Px-Sx” is returned, where “-B” is the baud

rate, “-D” is the data bit, “-P” is the parity bit, “-S” is the stop bit. If the command format is incorrect, the serial port will

return "ERROR↲".

"AT#UART-Bxxxx-Dx-Px-Sx↲": Configure parameter.

Enter the command into serial port. When the serial port prints "OK↲", which means successful operation. In this

command, “-B” is the baud rate, “-D” is the data bit, “-P” is the parity bit, “-S” is the stop bit. If the instruction format is

incorrect, the serial port will return "ERROR↲".

The parameter configuration command is saved into FLASH by default. After the devices is restarted, the device will

start with the parameters set in FLASH.

Default configuration: 115200 baud rate, 8 data bit, no parity bit, 1 stop bit.

5.2.3 RF Power Query / Configuration

"AT#RF↲": Query Tx power.

Enter the command into serial port. When the serial port prints "OK↲", which means successful operation. In the

meanwhile, the RF output power of the device will be returned. If "AT#RF-Px↲" is returned, where “-Px” means the RF

output power. If the command format is incorrect, the serial port will return "ERROR↲".

"AT#RF-Pxx↲": Configure RF power.

RF-SM-1077B1

command, “-Px” means the RF output power. The parameter of RF-SM-1077B1 supports any value of -10 dBm ~ 14

dBm. If the command format is incorrect, the serial port will return "ERROR↲".

Default configuration: RF-SM-1077B1: output power of 14 dBm (@868 MHz).

5.2.4 Channel Query / Configuration

"AT#CHN↲": Query channel.

meanwhile, the channel of this device will be returned. If "AT#CHN-Cx↲" is returned, where “-Cx” means the channel

parameter. If the command format is incorrect, the serial port will return "ERROR↲".

"AT#CHN-Cx↲": Configure channel.

command, “-C” means the RF channel. The parameter of RF-SM-1077B1 supports any value from 0 to 6. If the command

format is incorrect, the serial port will return "ERROR↲".

Default configuration: channel 0.

5.2.5 Received RSSI Query

"AT#RSSI↲": Query received RSSI.

meanwhile, the received signal strength indicator value of the device for the last time will be returned. If "AT#RSSI-Rx↲"

is returned, where “-Rx” means the RSSI. If the command format is incorrect, the serial port will return "ERROR↲".

If the command is entered when the device have no data received, the default return value is 255.

5.2.6 Device MAC Address Query

"AT#RSSI↲": Query device MAC address.

meanwhile, the 6-byte MAC address of the device will be returned. If "AT#MAC-Mxxxxxxxxxxxx↲" is returned, where “-

Mxxxxxxxxxxxx” means the MAC address. If the command format is incorrect, the serial port will return "ERROR↲".

5.2.7 Enable / Disable AD Voltage Collection

"AT#ADC-Ex↲": Collect AD voltage.

In this command, “-E” means enable AD voltage collection function. If x is 1, which means start AD voltage collection. If

x is 0, which means disable AD voltage collection. Enter the command into serial port. When the serial port prints "OK↲",

which means successful operation. If enable AD voltage collection function, the device will start AD voltage collection in

RF-SM-1077B1

ADC channel 0,1, and the serial port will return data in ADC channel 0,1 every second. If disable AD voltage collection

function, the device will stop AD voltage acquisition in ADC channel 0,1 and no data return. AD voltage collection

supports 0 V ~ 3.8 V, and the serial port return value is the integer from 0 mV to 3800 mV.

5.2.8 Software / Hardware Version Query

"AT#VER↲": Query module software / hardware version.

meanwhile, the software and hardware version number will be returned. If "AT#VER-Sm1.0.0-D1077B1↲" is returned,

where “-S” means software and the string of “m1.0.0” means the version number is1.0.0, “-Dx” means hardware and the

string of “1077B1” means the hardware version is 1077B1.

5.2.9 Module Restart

"AT#RESTART↲": Restart module.

meanwhile, the device will be automatically restarted after 100 ms. After restart is done, the serial port prints "Application

Start↲". If users want to enter the AT command mode again, "+++" need to be sent, please refer to AT command chapter

for details.

5.2.10 Module Reset

"AT#RESET↲" is module reset command.

meanwhile, all the parameters of the device are restored to the factory settings when the device starts next time.

5.2.11 AT Command Table

Table 7. AT Command Table

AT command Parameters Description

+++ No "+++": Start AT command mode.

"OK" indicates successful operation. Otherwise, the operation failed.

AT#EXIT No "AT#EXIT↲": Exit AT command mode.

"OK" indicates successful operation. Otherwise, the operation failed.

AT#VER No

"AT#VER↲": Query Module software and hardware version.

"OK" indicates successful operation and the serial port will return

software and hardware version, such as: AT#VER-Sm1.0.0-D1077B1.

Otherwise, the operation failed.

RF-SM-1077B1

AT#RESTART No

"AT#RESTART↲": Module restart command.

"OK" indicates successful operation and the device will restart after 100

ms, otherwise the operation failed.

AT#RESET No

"AT#RESET↲": Module reset command. The device configuration

parameters are restored to the factory settings.

"OK" indicates successful operation and all the parameters of the device

are restored to the factory settings in next time when the device starts to

AT#UART

-B: Baud rate (default

115200 bps)

-D: Data bit (default 8)

-P: Parity bit (default 0)

-S: Stop bit (default 1)

"AT#UART↲": Query parameters.

"OK" indicates successful operation and the serial port software prints

the current serial port configuration parameters, such as "AT#UART-

B11520-D8-P0-S1↲", otherwise the operation failed.

"AT#UART-B11520-D8-P0-S1↲": Configure parameters.

Baud rate supports: 115200, 38400, 57600, 14400, 9600, 4800.

Data bit supports: 8, 7, 6, 5.

Parity bit supports: 0 and 1.

Stop bit supports: 0 and 1.

"OK" indicates successful operation, "ERROR" indicates wrong

command and "FAIL" indicates failed operation.

-P: RF output power

Default: 14 dBm @868

"AT#RF↲": Query RF parameter.

"OK" indicates successful operation and the serial port returns the

current RF parameters, such as "AT#RF-P14 ↲", otherwise the operation

failed.

"AT#RF-P14↲": Configure parameters.

Output power supports: any value from -10 dBm ~ 14 dBm.

"OK" indicates successful operation, "ERROR" indicates wrong

command and "FAIL" indicates the failed operation.

AT#ADC

-E1: Enable data

collection of ADC

channel

-E0: Disable data

collection of ADC

channel

"AT#ADC-E1↲": Enable data collection of ADC channel 0, 1.

"OK" indicates successful operation and the serial port will print data

values of ADC channel 0,1 every second (voltage acquisition range

support 0 V ~ 3.8 V), otherwise the operation failed.

"AT#ADC-E0↲": Disable data collection of ADC channel 0,1.

"OK" indicates successful operation and shuts down data collection of

ADC channel 0,1.

AT#CHN -C: RF channel setup "AT#CHN↲": Query RF channel.

RF-SM-1077B1

"OK" indicates successful operation and the serial port software will print

RF channel parameter, otherwise the operation failed.

"AT#CHN-C1↲": Configure RF channel.

Set RF channel value as 1, "OK" indicates successful operation and the

parameter will be effective after restart.

AT Command with “” is the completed one.

6 Application, Implementation, and Layout

6.1 Module Photos

Figure 5. Photos of RF-SM-1077B1

RF-SM-1077B1

6.2 Recommended PCB Footprint

Figure 6. Top View of RF-SM-1077B1 (mm)

6.3 Antenna

RF-SM-1077B1 module is integrated the IPEX version 1 antenna seat, the specification of antenna seat is as follow:

Figure 7. Specification of Antenna Seat

RF-SM-1077B1

The specification of IPEX wire end is as follow:

Figure 8. Specification of IPEX Wire

6.4 Schematic Diagram

Figure 9. Schematic Diagram of RF-SM-1077B1

RF-SM-1077B1

6.5 Basic Operation of Hardware Design

1. It is recommended to offer the module with a DC stabilized power supply, a tiny power supply ripple coefficient and

the reliable ground. Please pay attention to the correct connection between the positive and negative poles of the

power supply. Otherwise, the reverse connection may cause permanent damage to the module;

2. Please ensure the supply voltage is between the recommended values. The module will be permanently damaged

if the voltage exceeds the maximum value. Please ensure the stable power supply and no frequently fluctuated

voltage.

3. When designing the power supply circuit for the module, it is recommended to reserve more than 30% of the margin,

which is beneficial to the long-term stable operation of the whole machine. The module should be far away from the

power electromagnetic, transformer, high-frequency wiring and other parts with large electromagnetic interference.

4. The bottom of module should avoid high-frequency digital routing, high-frequency analog routing and power routing.

If it has to route the wire on the bottom of module, for example, it is assumed that the module is soldered to the Top

Layer, the copper must be spread on the connection part of the top layer and the module, and be close to the digital

part of module and routed in the Bottom Layer (all copper is well grounded).

5. Assuming that the module is soldered or placed in the Top Layer, it is also wrong to randomly route the Bottom Layer

or other layers, which will affect the spurs and receiving sensitivity of the module to some degrees;

6. Assuming that there are devices with large electromagnetic interference around the module, which will greatly affect

the module performance. It is recommended to stay away from the module according to the strength of the

interference. If circumstances permit, appropriate isolation and shielding can be done.

7. Assuming that there are routings of large electromagnetic interference around the module (high-frequency digital,

high-frequency analog, power routings), which will also greatly affect the module performance. It is recommended

to stay away from the module according to the strength of the interference. If circumstances permit, appropriate

isolation and shielding can be done.

8. It is recommended to stay away from the devices whose TTL protocol is the same 868 MHz physical layer.

9. The antenna installation structure has a great influence on the module performance. It is necessary to ensure the

antenna is exposed and preferably vertically upward. When the module is installed inside of the case, a high-quality

antenna extension wire can be used to extend the antenna to the outside of the case.

10. The antenna must not be installed inside the metal case, which will cause the transmission distance to be greatly

weakened.

11. The recommendation of antenna layout.

The inverted-F antenna position on PCB is free space electromagnetic radiation. The location and layout of antenna

is a key factor to increase the data rate and transmission range.

Therefore, the layout of the module antenna location and routing is recommended as follows:

（1） Place the antenna on the edge (corner) of the PCB.

RF-SM-1077B1

（2） Make sure that there is no signal line or copper foil in each layer below the antenna.

（3） It is the best to hollow out the red part of the antenna position in the following figure so as to ensure that S11

of the module is minimally affected.

Figure 10. Recommendation of Antenna Layout

6.6 Trouble Shooting

6.6.1 Unsatisfactory Transmission Distance

1. When there is a linear communication obstacle, the communication distance will be correspondingly weakened.

Temperature, humidity, and co-channel interference will lead to an increase in communication packet loss rate. The

performances of ground absorption and reflection of radio waves will be poor, when the module is tested close to

the ground.

2. Seawater has a strong ability to absorb radio waves, so the test results by seaside are poor.

3. The signal attenuation will be very obvious, if there is a metal near the antenna or the module is placed inside of the

metal shell.

4. The incorrect power register set or the high data rate in an open air may shorten the communication distance. The

higher the data rate, the closer the distance.

5. The low voltage of the power supply is lower than the recommended value at ambient temperature, and the lower

the voltage, the smaller the power is.

6. The unmatchable antennas and module or the poor quality of antenna will affect the communication distance.

RF-SM-1077B1

6.6.2 Vulnerable Module

1. Please ensure the supply voltage is between the recommended values. The module will be permanently damaged

if the voltage exceeds the maximum value. Please ensure the stable power supply and no frequently fluctuated

voltage.

2. Please ensure the anti-static installation and the electrostatic sensitivity of high-frequency devices.

3. Due to some humidity sensitive components, please ensure the suitable humidity during installation and application.

If there is no special demand, it is not recommended to use at too high or too low temperature.

6.6.3 High Bit Error Rate

1. There are co-channel signal interferences nearby. It is recommended to be away from the interference sources or

modify the frequency and channel to avoid interferences.

2. The unsatisfactory power supply may also cause garbled. It is necessary to ensure the power supply reliability.

3. If the extension wire or feeder wire is of poor quality or too long, the bit error rate will be high.

6.7 Electrostatics Discharge Warnings

The module will be damaged for the discharge of static. RF-star suggest that all modules should follow the 3 precautions

below:

1. According to the anti-static measures, bare hands are not allowed to touch modules.

2. Modules must be placed in anti- static areas.

3. Take the anti-static circuitry (when inputting HV or VHF) into consideration in product design.

Static may result in the degradation in performance of module, even causing the failure.

6.8 Soldering and Reflow Condition

1. Heating method: Conventional Convection or IR/convection.

2. Temperature measurement: Thermocouple d = 0.1 mm to 0.2 mm CA (K) or CC (T) at soldering portion or equivalent

methods.

3. Solder paste composition: Sn/3.0 Ag/0.5 Cu

4. Allowable reflow soldering times: 2 times based on the following reflow soldering profile.

5. Temperature profile: Reflow soldering shall be done according to the following temperature profile.

6. Peak temperature: 245 ℃.

RF-SM-1077B1

Figure 11. Recommended Reflow for Lead Free Solder

4.9 Optional Packaging

Figure 12. Optional Packaging Mode

Note: Default tray packaging.

RF-SM-1077B1

7 Certification

7.1 Reach

Reach Certificate No.: C181213010001

Figure 13. SRRC Certificate

7.2 RoHS

Reach Certificate No.: C181213010002

Figure 14. RoHS Certificate

RF-SM-1077B1

8 Revision History

Date Version No. Description Author

2017.10.19 V1.0 The initial version is released. Levi

2018.03.12 V2.0 Add commands. Levi

2018.01.24 V2.1 Add inquiry MAC address function. Levi

2018.08.02 V2.1 Update company address. Aroo Wang

9 Contact Us

SHENZHEN RF-STAR TECHNOLOGY CO., LTD.

Shenzhen HQ:

Add.: Room 601, Block C, Skyworth Building, High-tech Park, Nanshan District, Shenzhen, Guangdong, China

Tel.: 86-755-8632 9687

Chengdu Branch:

Add.: No. B4-12, Building No.1, No. 1480 Tianfu Road North Section (Incubation Park), High-Tech Zone, Chengdu,

China (Sichuan) Free Trade Zone, 610000

Tel.: 86-28-6577 5970

Email: sunny@szrfstar.com, sales@szrfstar.com

Web.: www.szrfstar.com

RF-SM-1077B1 Ultra-Low-Power 868 MHz & 915 MHz Wireless … · RF-SM-1077B1 Ultra-Low-Power 868...

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